Overfilling a differential can cause excessive pressure and aeration, leading to foam and lubrication failure, while underfilling results in inadequate lubrication and premature wear. They also pour better in freezing temperatures and maintain their protective film integrity in high-heat scenarios where conventional oils would fail.
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This uniformity provides enhanced resistance to oxidation, meaning the oil breaks down much slower over time, extending drain intervals significantly. Modern synthetic formulations offer superior thermal stability, maintaining their viscosity index across a wide temperature range, which is essential for vehicles operating in extreme climates or under severe duty cycles.
The balance of these additives defines the oil's performance characteristics and its suitability for specific applications. If the oil is too thin, it will shear down under pressure, leading to increased wear.
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Some units require special procedures to ensure proper seating of the new seals and to eliminate air pockets that could affect performance. These additives are designed to activate under the intense heat and pressure of gear meshing, creating a temporary sacrificial layer on the metal surfaces.
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